Czech mathematician, logician, and philosopher who anticipated Frege and Husserl by positing abstract propositions and ideas in themselves (Sätze an sich), independent of any mind.
Propositions in themselves: there are abstract, objective propositions (Sätze an sich) that are true or false independently of whether anyone thinks them. Mathematical rigor: provided the first rigorous definition of the limit and contributed to the arithmetization of analysis. Paradoxes of the Infinite: argued that infinite sets can be put in one-to-one correspondence with proper subsets.
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